Adjustable support for school-desks



(No Model.) v

G. A. BOBRICK.

ADJUSTABLE SUPPURT FOR SCHOOL DESKS.

No. 541,806. Patented June 25,1895.

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` UNITED STATES PATENT OFFICE.

.GABRIEL A. BOBRICK, OF BOSTON, MASSACHUSETTS.

ADJUSTABLE SUPPORT FOR SCHOOL-DESKS.

srncrrlcn'rrolv forming part of Letters Patent No. 541,806, dated. June 25, 1895.

Application iisd :amm 1e, 1895. seria No. 535,092. cio man.)

To LZZ whom, t may con/cerro.-

Be it known that I, GABRIEL A. BoBRIcK, of Boston, county of Suffolk, State of Massachusetts, have invented an Improvement in Adjustable Supports for School-Desks, dac., of which the following description, in connection with the accompanying drawings, isV a specification, like letters on the drawings representing like parts.

This invention relates to adjustable supports for furniture, and more particularly to school desks and seats, which must be adjustable in accordance with the heightof the pupils, and my invention has for its object the production of a support for such furniture which is strong and serviceable in construction, readily and quickly adjustable, and so arranged .that adjustment will be accomplished with entire safety to the operator.

In accordance therewith myinvention consists in various details of construction andl arrangement hereinafter described at length in the specification and particularly pointed out in the claims.

Figure l in side elevation, with the mov- Vable member of one of the supports broken out, represents one embodiment of myiinvention as applied to a school desk. Fig. 2 is an enlarged sectional View, taken on the line 0o ec, Fig. l, showing the two standards or supports. Fig. 3 is a vertical section taken on the line fr', Fig. 2. Fig. 4 represents in side elevation a school seat or chair with a slightly modified form of support, and Fig. 5 is an enlarged sectional view on the line y y, Fig. 4.

In Fig. 1, I have shown a school desk A as having secured to its under side the brackets or cross arms of like metal bars a, h, longitudinally slotted at ax, bx, respectively. While these bars, which form the movable or adjustable members ot' the supports, are alike, they have been designated by different reference letters for the sake of clearness in description. These bars are shown as central webs, in which are made the slots ax, bx, and enlarged at their longitudinal edges to form separated `but -converging faces, a and b', respectively, transversely toothed or notched, see Figs. l and 3, to engage the inner similarly converged and transversely notched bearings d2, b2, in the heads a3, b3, respectively, of the two like standards or fixed members et,

b4, of the supports. I. Each head has an opening in one side for-the Shanks of suitable bolts c and d, whichare extended through the slots in the movable members a and b ot' the supports, and then through large Washers w, 1

w', which enter freely suitable holes in the opposite sides of the heads, as clearly shown in Figs. 2 and 3, and set nuts nretain the bolts or clamping screws in place.

Referring to Fig..2, it will be seen that the i washers w and w bearing on the correspondj ing sides of the movable members.

While the screws are tight, as in Fig. 2, the notched or toothed faces ofthe movable member of each support will be held in close engagement with the correspondingly notched bearings of the head of each fixed member, but when the nuts n are loosened the two bars a and b can be moved into dotted line position, Fig. 3, preparatory to being adjusted. Thus by grasping the desk A the operator, moving it laterally, will cause engagement or disengagement of. the bearings and co-operating converging faces. A loose washer w surrounds the screw c between the nut n and the side of the head a3, and to make .ber a, the weight of the desk being so distributed as to cause said toes to normally enter one of the notches of its co-operating series.

When the desk is to be lowered the operator unclamps the movable members a and b as described, moves the desk laterally and IOO also forward, thereby disengaging first the notched converging faces and bearings, and then the supporting toes from their notches, after which the desk can be lowered to the desired height and released, the toes catching in their co-operating series of teeth to support it until again clamped.

In Figs. 4 and 5 the construction of the support is modified to adapt it to a desk or chair B, to the under side of which is attached the movable member e, longitudinally slotted, and having converging faces e', transversely notched or toothed. These faces are held against similar converging bearingsf in the basef, by a clamping screw]c2 and nut n, the nut bearing against the outer side of a washer f3 entering a hole in the side of the base, tightening of the nut drawing the washer against the member e and forcing the faces e' against the bearingsfl of the base.

In the modification the supporting toe and its (3o-operating series of notches, forming a detent, are omitted.

The converging bearings in the fixed members or standards are long enough to give a firm, steady bearing for the movable members when clamped.

I claiml. An adjustable desk having secured thereto two depending longitudinally slotted bars, one of said bars being transversely notched on its inner side, and the other bar on its outer side, combined with two fixed standards each having transversely notched bearings to cooperate with the adjacent notched sides of the bars, and clamping screws extended through said standards and slotted bars, to draw the notched sides 'of the bars against the bearings in the standards, whereby when the clam ping screws are loosened lateral bodily movement of the desk will disengage the bars from the bearings, to permit adjustment of the desk, substantially as described.

2. An adjustable desk having secured there-l to two depending longitudinally slotted bars, and two converging, transversely notched separated faces lon corresponding sides of said' bars, combined with two fixed open-headed standards, to receive the said bars, converging transversely notched bearings within each head to co-operate with the converging faces of the bar movable therein, clamping screws extended th rough said heads and slotted bars, to draw the converging faces of the bars against the bearings in the head, and thereby clamp said bars, and a detent to normally retain each bar from downward movement'l when nnclamped, lateral movement of the desk disengaging the converging faces and bearings when the clamping screws are loosened, substantially as described.

3. An adjustable support forfurniture, consisting of a fixed member or vstandard having an open head, transversely notched converging bearings in one side of said head, and a washer loosely held in the head opposite said bearings, combined with a longitudinally slotted member movable in said head, converging and transversely notched faces on one side thereof to co-operate with said bearings, and a clamping screw in the head extended through the slotted bar and washer, to draw said faces against the bearings in the head when clamped, substantially as described.

4. An adjustable desk having secured thereto two depending longitudinally slotted bars,

and two converging, transversely notched separated faces on corresponding sides of said bars, combined with two fixed openheaded standards, to receive the said bars, converging transversely notched bearings within each head to co-operate with the converging faces of the bar movable therein, clamping screws extended through said heads and slotted bars, Washers loosely held in said heads opposite the bearings and on the screws, to clamp said bars between the washers and the said bearings, and a detent to normally retain each bar from downward movement when nnclamped, lateral movement of the desk disengaging the converging faces and bearings, substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

GABRIEL A. BOBRICK.

Witnesses:

AUGUSTA E. DEAN, JOHN C. EDWARDS. 

